Add QT GUI to Python for plotting graphics

Last Updated : 19 Feb, 2020

Qt framework (with QT Creator IDE) can be used to create a fancy interfaces for Python GUI application. Plotting graphics on a GUI is possible with pyqtgraph library.

Installing pyqtgraph –
There are several ways of installing pyqtgraph depending on your needs.

If you are using Anaconda you can install with:

conda install -c anaconda pyqtgraph

Or with pip command:

pip install pyqtgraph

Creation of plot widgets with QT Creator –

Add the buttons, text areas and other stuffs as usually done with QT Creator. To create a plot area you need to follow the steps:

Add widget to UI and give it a proper name like “widgetSignal”
Promote the widget to pyqtgraph

Load UI to Python –

In your python code call the UI you created with QT Creator.
Create a sin wave for plotting
Draw the graph on UI

from PyQt5 import QtWidgets, uic 
import sys 
import numpy as np 
  
class MainWindow(QtWidgets.QMainWindow): 
      
    def __init__(self, *args, **kwargs): 
        super(MainWindow, self).__init__(*args, **kwargs) 
         # Load the UI Page 
        self. ui = uic.loadUi('mainwindow.ui', self) 
        # Create a sin wave 
        x_time = np.arange(0, 100, 0.1); 
        y_amplitude = np.sin(x_time) 
          
        pltSignal = self.widgetSignal 
        pltSignal.clear() 
        pltSignal.setLabel('left', 'Signal Sin Wave', units ='(V)') 
        pltSignal.setLabel('bottom', 'Time', units ='(sec)') 
        pltSignal.plot(x_time, y_amplitude, clear = True) 
  
        self.ui.show() 
  
def main(): 
    app = QtWidgets.QApplication(sys.argv) 
    window = MainWindow() 
    sys.exit(app.exec_()) 
  
if __name__ == '__main__': 
    main()      